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"Fertilizer contains salts, which draw moisture out of plants. When you apply excess fertilizer to plants, the result is yellow or brown discoloration and root damage."
You'd require extremely highly saline soil to create that kind of negative osmosis and so what you are saying is leaves burn because of this? And also what you see in the leaves is occurring in the leaves at a cellular level and not the roots because under massive osmotic stress the plant can't uptake water and nutrient and this means no cooling in the leaves through transpiration. Other things also occur when a plant is stressed which results in leaf burning but again this is all occurring in the leaves - albeit part of a chain reaction of events.
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